Castle Hook Partners’s MarketAxess Holdings MKTX Stock Holding History

Castle Hook Partners’s Portfolio MKTX Stock Details MKTX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q4	–	Sell	-11,235	Closed	-$1.96M	–	74
2025 Q3	$1.96M	Buy	+11,235	New	+$2.2M	0.01%	57
2025 Q1	–	Sell	-6,330	Closed	-$1.43M	–	47
2024 Q4	$1.43M	Sell	6,330 -161,380	-96%	-$42.5M	0.02%	42
2024 Q3	$43M	Buy	+167,710	New	+$39.3M	0.81%	28

Other funds holding MKTX

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return

AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

NRCM

North Reef Capital Management Laguna Beach, California $2.61B AUM 11.5% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

VanEck Associates New York $164B AUM 112.45% 1-Year Est. Return

GAM

GuardCap Asset Management London, United Kingdom $1.41B AUM 8.17% 1-Year Est. Return

Bank of Montreal Toronto, Ontario, Canada $304B AUM 35.64% 1-Year Est. Return

Castle Hook Partners's MKTX Position: Q4 2025 in Review

Castle Hook Partners sold out of MarketAxess Holdings (MKTX) in Q4 2025, closing a stake of 11,235 shares — an estimated $1.96M sold.

Castle Hook Partners first reported a position in MKTX in Q3 2024 and held it in 3 quarters. The position peaked at $43M in Q3 2024. 487 funds tracked by Wall St. Rank hold MKTX as of Q4 2025.

Castle Hook Partners reported no remaining MarketAxess Holdings position as of Q4 2025 after selling out during the quarter.
Castle Hook Partners sold 11,235 MarketAxess Holdings shares in Q4 2025, an estimated $1.96M.
Castle Hook Partners first reported a position in MarketAxess Holdings in Q3 2024 and held it in 3 quarters.
Castle Hook Partners's MarketAxess Holdings position peaked at $43M in Q3 2024.
487 funds tracked by Wall St. Rank held MarketAxess Holdings as of Q4 2025.

Based on Castle Hook Partners's 13F filing for Q4 2025, filed 17 Feb 2026.